Cast iron pans

[Otter 1200]

FIL bought an old house built in the 40’s right before he passed away in 2016 (you can tell house was built during WWII, basement has 12”+ concrete walls-bomb shelter) People that owned it left everything as part of the deal, I helped clean it out after he passed away. Along with a ton of other old crap was a pretty good lot of Cast iron pans. No one had lived in the house in 5+ years and they were in bad shape. I started cleaning the 1st one this week-just to see how bad it would be, surprising is the pans only have sizes and numbers, no MFG information. Anyway, Been studying/reading as much as I can about reconditioning them. Cleaned the first one over the last few days and started re-seasoning tonight, not sure they are worth saving after the work in this 1st one. Any of you guys have a good simple method? I went with oven cleaner, sanding, oven cleaner, sanding, etc. Seasoning is oil coating, 450 for 30 minutes, repeat, 4 times.